| 4:22:38 AM PST - Tue, Jan 10th 2012 |
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George,
Storngly suggest to run one process per core, not two (for one to reduce memory and communication pressure). Also, I don't know how much data is written to disk, which could affect the CPU usage.
The number of processes should be constant.
Bert
Quote: Jan 9th 2:23 pmHi
Apologies if this has been discussed. I am running NWChem on a Linux cluster (12 cores/24 threads)
using the following command
/opt/openmpi/bin/mpirun -np 24 nwchem bv6-esp-res.nw >& bv6-esp-res2.out &
The job starts normally on all threads with high CPU load (~100%) but after some seconds
the CPU load drops very low, to ~2%-15%. Also, the number of processes appears to
decrease and fluctuate.
Is this behaviour normal?
Thanks in advance
George |